JP6873662B2 - Orbital shield excavator and orbital tunnel excavation method - Google Patents

Description

The present invention relates to an orbital shield excavator and an orbital tunnel excavation method.

Conventionally, a circuit shield excavator used for excavating a circuit tunnel surrounding an existing tunnel has been known. For example, Patent Document 1 discloses a bucket excavation type orbital shield excavator.

Specifically, the orbital shield excavator disclosed in Patent Document 1 includes an excavator main body having a bucket drive mechanism and a shield jack that propels in the orbital direction, and an erector device towed by the excavator main body via a wire. including. The excavator body propels the assembled segment by taking a reaction force by extending the shield jack. The Elekta device assembles the segments in the space inside the excavator body when the shield jack is shortened.

Japanese Unexamined Patent Publication No. 2010-106593

However, in the orbital shield excavator disclosed in Patent Document 1, since the excavator device is towed by the excavator body, the position where the excavator device assembles the segment always changes. Therefore, the operator must perform the operation of the erector device and the fastening work of the segments at the time of segment assembly in different postures depending on the propulsion position of the excavator main body. In addition, it is necessary to transport the segment in the orbital direction to the vicinity of the excavator main body through a part of the orbital tunnel that has already been excavated, which requires a great deal of labor to convey the segment.

Therefore, the present invention provides an orbital shield excavator that can simplify the operation of the elector device at the time of segment assembly, the work of fastening the segments to each other, and the work of transporting the segments, and the orbital tunnel excavation method using the orbital shield excavator. The purpose is.

In order to solve the above problems, the orbital shield excavator of the present invention has an excavator main body that propels in the orbital direction from a start base provided in the ground and a side opposite to the propulsion direction of the excavator main body at the start base. An excavator device attached to the rear wall surface of the digging machine to assemble a plurality of segments to generate a segment ring, and a plurality of excavator devices attached to the rear wall surface to push out a segment ring generated by the erector device toward the excavator main body. It is characterized by being equipped with an excavator jack.

According to the above configuration, the segment ring generated by the Elekta device mounted on the rear wall surface of the starting base is pushed toward the excavator body by the main push jack, so that the operation of the Elekta device during segment assembly and the segments are used together. Can be fastened in the starting base. Moreover, it is not necessary to transport the segment through a part of the circuit tunnel that has already been excavated. Therefore, it is possible to simplify the operation of the elector device at the time of assembling the segments, the fastening work between the segments, and the transporting work of the segments.

The excavator main body advances the cutter head, the front body that supports the cutter head, the front body and the slidable rear body, the front body with respect to the rear body, and the front body with respect to the front body. It may include a plurality of shield jacks that attract the rear fuselage. In the orbital shield excavator disclosed in Patent Document 1, when the excavator main body is propelled upward, the thrust of the shield jack needs to bear the weight of the erector device. On the other hand, according to this configuration, the thrust of the shield jack does not have to bear the gravity of the erector device. Therefore, the thrust required for the shield jack can be reduced.

The elector device includes a tubular swivel shaft that rotates around a central axis, a segment grip portion, and a slide mechanism attached to an outer peripheral surface of the swivel shaft that slides the elector grip portion. The base is provided so as to extend from the existing tunnel, and a hydraulic pipe is passed from the hydraulic pump unit arranged in the existing tunnel or the starting base to the excavator main body through the inside of the swivel shaft of the elector device. May be connected. According to this configuration, the hydraulic piping can be arranged by utilizing the inside of the hollow elector device. Moreover, since the hydraulic pump unit that is the pressure source is arranged in the existing tunnel or the starting base, the hydraulic pump unit can be easily maintained.

For example, the erector device may include a tubular swivel that rotatably supports the swivel shaft, which may extend with the swivel to form a continuous interior space.

Further, the orbital tunnel excavation method of the present invention is characterized in that the orbital tunnel is excavated by using the above-mentioned orbital shield excavator. According to this configuration, excavation of the circuit tunnel can proceed smoothly.

Before the excavator body penetrates the rear wall surface, the erector device and the plurality of push jacks are removed from the rear wall surface and moved to an intermediate position of the starting base, and the excavator body is placed on the rear wall surface. A passable guide cylinder may be attached, and the guide cylinder may be filled with fluidized soil. According to this configuration, it is possible to stop water when the excavator main body penetrates the rear wall surface of the starting base.

According to the present invention, it is possible to simplify the operation of the elector device at the time of assembling the segments, the fastening work between the segments, and the transporting work of the segments.

It is a schematic block diagram of the orbital shield excavator which concerns on one Embodiment of this invention. It is a side view of the Elekta device. It is sectional drawing along the line III-III of FIG. It is sectional drawing along the IV-IV line of FIG. It is a figure which shows the relationship between an existing tunnel and a circuit tunnel. It is a figure for demonstrating the circuit tunnel excavation method, and shows the state before installing the circuit shield excavator. It is sectional drawing along the line VII-VII of FIG. It is a figure for demonstrating the excavation method of the orbiting tunnel, and shows the state which the excavator main body of the orbiting shield excavator slightly propelled. It is a figure for demonstrating the excavation method of the orbiting tunnel, and shows the state before the excavator main body of the orbiting shield excavator passes through the rear wall surface of the starting base.

FIG. 1 shows an orbiting shield excavator 1 according to an embodiment of the present invention. As shown in FIG. 5, the orbital shield excavator 1 is used in an orbital tunnel excavation method for excavating an orbital tunnel 83 that surrounds an existing tunnel 81.

In FIG. 5, the circuit tunnel 83 has a circular shape, but the circuit tunnel 83 may have another shape such as an ellipse. Further, in FIGS. 5 to 9, as an example, a case where a branching / confluence portion between the existing tunnel 81 and another existing tunnel 82 is constructed is shown, but there is only one circuit tunnel excavation method using the circuit shield excavator 1. It is also useful when expanding the existing tunnel 81 of the above.

As shown in FIG. 6, when the orbital shield excavator 1 is used, the starting base 11 extending from the existing tunnel 81 is first provided in the ground, and then the orbiting shield excavator 1 is installed in the starting base 11. In FIG. 6, the starting base 11 extends laterally from the existing tunnel 81, but the starting base 11 may extend upward or downward from the existing tunnel 81.

As shown in FIGS. 6 and 7, the starting base 11 is surrounded by a concrete wall 12, and has a substantially U-shape that opens toward the center of the existing tunnel 81 in both the vertical and horizontal sections. A concrete pillar 13 is also erected in the center of the opening of the starting base 11.

In the present embodiment, the cross section of the circuit tunnel 83 has a rectangular shape that is long in the extending direction of the existing tunnel 81 as shown in FIG. However, the cross section of the circuit tunnel 83 is not limited to this, and may be, for example, an elliptical shape or a circular shape.

As shown in FIG. 1, the orbital shield excavator 1 includes an excavator main body 2 and an erector device 4. The excavator main body 2 is propelled from the starting base 11 in the circumferential direction so as to surround the existing tunnel 81. The erector device 4 is attached to the rear wall surface 14 (upper surface in the present embodiment) on the side opposite to the propulsion direction of the excavator main body 2 at the starting base 11.

In the present embodiment, the erector device 4 is attached to the rear wall surface 14 of the starting base 11 via the gantry 6. As shown in FIG. 7, the gantry 6 has a plurality of beams 63 arranged in the extending direction of the existing tunnel 81 along the rear wall surface 14, and a first receiving girder 61 that supports the end of the beam 63 on the existing tunnel 81 side. And a second receiving girder 62 that supports the end of the beam 63 on the opposite side of the existing tunnel 81. However, the elector device 4 may be directly attached to the rear wall surface 14 of the starting base 11.

Returning to FIG. 1, the excavator body 2 includes a cutter head 21, a front body 22, and a rear body 26. The front body 22 rotatably supports the cutter head 21, and the rear body 26 is slidable with the front body 22.

Specifically, the front body 22 includes a tubular front casing 23 that bends at the same curvature as the circumferential tunnel 83, and a front wall 24 that closes the front opening of the front casing 23. The rear fuselage 26 is a tubular rear casing 27 that fits into the front casing 23 of the front fuselage 22 and bends at the same curvature as the circumferential tunnel 83, and an annular structure joined to the rear end portion of the rear casing 27. 28 is included.

Further, the excavator main body 2 includes a plurality of shield jacks 29 in the front body 22 and the rear body 26. The shield jacks 29 are arranged at a predetermined pitch along the inner peripheral surfaces of the front casing 23 and the rear casing 27 (the number of shield jacks 29 is, for example, 20 to 40). One end of each shield jack 29 is connected to a bracket 25 attached to the front wall 24 of the front fuselage 22 or the inner peripheral surface of the front casing 23, and the other end is connected to the structure 28 of the rear fuselage 26. Has been done. The shield jack 29 advances the front torso 22 with respect to the rear torso 26 and draws the rear torso 26 with respect to the front torso 22.

The erector device 4 assembles a plurality of segments 3 to generate a segment ring 30. Specifically, as shown in FIGS. 2 to 4, the erector device 4 includes a tubular swivel base 41 and a tubular swivel shaft 43. The swivel 41 extends downward from the gantry 6, and the swivel shaft 43 extends downward from the swivel 41 so as to form a continuous internal space together with the swivel 41. In the present embodiment, the central axis of the swivel shaft 43 coincides with the central axis of the swivel base 41.

The swivel shaft 43 is rotatably supported by the swivel base 41 via a swivel bearing 42. In the present embodiment, the swivel bearing 42 includes an inner ring fastened to the swivel base 41 and an outer ring fastened to the swivel shaft 43 with outer teeth formed. A drive gear 40 attached to a motor (not shown) meshes with the outer teeth of the outer ring of the swivel bearing 42, and the motor rotates the swivel shaft 43 around its central axis.

Further, the erector device 4 includes a slide mechanism 44 attached to the outer peripheral surface of the swivel shaft 43 and a segment grip portion 47 slid by the slide mechanism 44. In the present embodiment, a lift mechanism 45 and a yawing mechanism 46 are also provided between the slide mechanism 44 and the segment grip portion 47. The lift mechanism 45 includes a hydraulic cylinder 45a and lifts the segment grip portion 47 as shown by an arrow A in FIG. The yawing mechanism 46 includes a hydraulic cylinder 46a and causes the segment grip portion 47 to yaw as shown by an arrow B in FIG.

In the slide mechanism 44, a hollow main body 44a integrally formed with the swivel shaft 43, a slide member 44b penetrating the main body 44a, a head is connected to the main body 44a, and the tip of the rod is connected to the slide member 44b. Includes a connected hydraulic cylinder 44c.

A hydraulic motor or the like for rotating the cutter head 21 is arranged in the front body 22 of the excavator main body 2 described above. Therefore, as shown in FIG. 1, the excavator main body 2 has a hydraulic pump unit arranged in the existing tunnel 81 or the starting base 11 through the inside of the swivel base 41 and the swivel shaft 43 of the elector device 4. The hydraulic pipe 7 is connected from (not shown).

Further, a screw conveyor (not shown) for sending out the excavated mud to the rear is arranged in the front body 22 of the excavator main body 2, and the mud drain pipe extending from the screw conveyor is also an elector device 4. It extends through the inside of the swivel base 41 and the swivel shaft 43. Further, a plurality of electric plates are arranged in the existing tunnel 81 or the starting base 11, and various electric cables for connecting these electric plates and the excavator main body 2 are also the swivel base 41 and the swivel shaft of the erector device 4. It extends through the interior of 43.

A plurality of push jacks 5 are directly attached to the rear wall surface 14 of the starting base 11. However, the main push jack 5 may be attached to the rear wall surface 14 via the gantry 6. The main push jack 5 pushes the segment ring 30 generated by the erector device 4 toward the excavator main body 2. The main push jacks 5 are arranged at a predetermined pitch along the segment ring 30 (the number of the main push jacks 5 is, for example, 50 to 80).

Next, a circuit tunnel excavation method using the circuit shield excavator 1 will be described with reference to FIGS. 6 to 9.

As shown in FIGS. 6 and 7, after the starting base 11 is completed, the gantry 6 is attached to the rear wall surface 14 of the starting base 11. Further, an entrance for the excavator main body 2 is formed by a concrete wall 84 and a steel pipe 85 on the front wall surface (lower surface in the present embodiment) of the excavator main body 2 on the propulsion direction side of the starting base 11. A plurality of brushes 86 for sealing between the excavator main body 2 or the segment ring 30 and the steel pipe 85 are attached to the inner peripheral surface of the steel pipe 85.

Then, the excavator main body 2 which is divided and carried in is assembled in the starting base 11, and the assembled excavator main body 2 is inserted into the steel pipe 85. Further, the elector device 4 is attached to the rear wall surface 14 of the starting base 11 via the gantry 6. Further, a main push jack 5 is attached to the rear wall surface 14.

After that, as shown in FIG. 8, the creation of the segment ring 30 by the erector device 4, the propulsion of one ring of the excavator main body 2, and the pressing of the entire segment ring 30 by the main push jack 5 are repeated. As a result, the excavation of the circuit tunnel 83 can proceed smoothly.

As shown in FIG. 9, after the excavator main body 2 has propelled to some extent, that is, before the excavator main body 2 penetrates the rear wall surface 14 of the starting base 11, the erector device 4 and the main push jack 5 are moved behind the starting base 11. It is removed from the wall surface 14 and moved to an intermediate position of the starting base 11 using the gantry 91. Next, a guide cylinder 92 through which the excavator main body 2 can pass is attached to the rear wall surface 14 of the starting base 11, and the guide cylinder 92 is filled with fluidized soil 93. As a result, it is possible to stop water when the excavator main body 2 penetrates the rear wall surface 14 of the starting base 11.

As described above, in the orbital shield excavator 1 of the present embodiment, the segment ring 30 generated by the erector device 4 attached to the rear wall surface 14 of the starting base 11 is directed toward the excavator main body 2 by the main push jack 5. Since it is pushed out, the operation of the erector device 4 at the time of segment assembly and the fastening work of the segments 3 can be performed in the starting base 11. Moreover, it is not necessary to transport the segment 3 through a part of the circuit tunnel that has already been excavated. Therefore, it is possible to simplify the operation of the elector device 4 at the time of assembling the segments, the fastening work between the segments 3, and the transporting work of the segments 3.

By the way, in the orbital shield excavator disclosed in Patent Document 1, since the excavator device is pulled by the excavator body, the thrust of the shield jack reduces the weight of the excavator device when the excavator body is propelled upward. You have to bear. On the other hand, in the orbiting shield excavator 1 of the present embodiment, the thrust of the shield jack 29 does not need to bear the gravity of the erector device 4. Therefore, the thrust required for the shield jack 29 can be reduced.

Further, in the present embodiment, since the elector device 4 includes the tubular swivel base 41 and the tubular swivel shaft 43, the inside of the hollow elector device 4 is used to connect the hydraulic pipe 7 and various electric cables. The lines can be arranged, and the mud drain pipe can be installed so as to penetrate the elector device 4. Moreover, since the hydraulic pump unit and the plurality of electric panels as the power source are arranged in the existing tunnel 81 or the starting base 11, the hydraulic pump unit and the plurality of electric panels can be easily maintained.

(Modification example)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, the excavator main body 2 may be a bucket excavator type like the orbital shield excavator disclosed in Patent Document 1 without including the cutter head 21.

Further, the shield jack 29 does not necessarily have to be provided and can be omitted. In this case, the excavator main body 2 is propelled by the main push jack 5 pressing the excavator main body 2 through the segment ring 30.

Further, the combined use of the shield jack 29 and the push jack 5 is useful not only for the orbiting shield excavator 1 but also for a normal shield excavator that propels linearly or with a large radius of curvature.

Further, the erector device 4 may not include the swivel base 41, and the gantry 6 may be configured to support the inner ring of the swivel bearing 42. That is, the hydraulic pipe 7, various electric cables, and the mud drain pipe may pass only inside the swivel shaft 43 of the elector device 4.

1 Circular shield excavator 11 Start base 14 Rear wall surface 2 Excavator body 21 Cutter head 22 Front body 26 Rear body 29 Shield jack 3 Segment 30 Segment ring 4 Electa device 41 Swivel stand 43 Swivel shaft 44 Slide mechanism 47 Segment grip part 5 yuan Push jack 7 Hydraulic piping 92 Guide cylinder 96 Fluidized soil

Claims (7)

And excavator body to start the base or et promotion provided in the ground,
An erector device attached to a rear wall surface opposite to the propulsion direction of the excavator body at the starting base and assembling a plurality of segments to generate a segment ring.
A plurality of main push jacks attached to the rear wall surface to push the segment ring generated by the erector device toward the excavator main body.
Provided with, shea Rudo excavator. The excavator main body advances the cutter head, the front body that supports the cutter head, the front body and the slidable rear body, the front body with respect to the rear body, and the front body with respect to the front body. including a plurality of shield jacks attracting said rear cylinder, shea Rudo excavator according to claim 1. The erector apparatus includes a cylindrical pivot shaft which rotates about a central axis, and the segment gripper, said erector gripper is slid, a slide mechanism attached to the outer peripheral surface of the pivot shaft, the including, according Shi Rudo excavator according to claim 1 or 2. The elector device includes a tubular swivel that rotatably supports the swivel shaft.
The pivot shaft extends so as to form an inner space which is continuous with the revolving base, shea Rudo excavator according to claim 3. The shield excavator is an orbiting shield excavator in which the excavator main body propels the excavator body in the circumferential direction from the starting base.
The shield excavator according to any one of claims 1 to 4, wherein the starting base extends laterally from an existing tunnel, and the rear wall surface of the starting base is an upper surface. The shield excavator according to any one of claims 1 to 5, wherein the elector device includes a segment grip portion, a lift mechanism for lifting the segment grip portion, and a yawing mechanism for yawing the segment grip portion. Belt tunnel excavation method to excavate the tunnel using a sheet Rudo excavator according to any one of claims 1-6.

Images